Glucose Tolerance Test(GTT): Introduction, Procedure, Result-Interpretation, and Keynotes
Table of Contents
The glucose tolerance test (GTT), also known as the oral glucose tolerance test (OGTT) is useful to measure the body’s response to sugar (glucose)and it can be used to screen for type 2 diabetes. More commonly, a modified version of the glucose tolerance test is called the glucose challenge test (GCT) which is used to find gestational diabetes -a type of diabetes that develops during pregnancy.
The GTT is done in several steps. After arriving at the laboratory, a phlebotomist will take a sample of blood from a vein in your arm. This blood sample will be used to measure your fasting blood glucose level. The health care provider’s office/lab will provide 75 gm sugar and a glass with water having nearly 237 ml of water that you have to drink and wait for 2 hours. Just after the completion of 2 hours, a blood sample will be taken from a vein in your arm. This blood specimen will be used to measure your blood sugar level. After the GTT, you can return to your usual activities immediately.
GTT is tested for type 2 diabetes and two hours after drinking the glucose solution report
will be as follows-
| Range | Condition |
| <140 mg/dL (7.8 mmol/L) | Normal |
| 140 and 199 mg/dL (7.8 and 11 mmol/L) | Impaired glucose tolerance, or prediabetes |
| ≥200 mg/dL (11.1 mmol/L) | Diabetes |
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